Circuit-switch.



J. G. WRASSE.

CIRCUIT SWITCH.

APPLICATION FILBDIQGT. so, 1913.

Patented Jan. 5, 1915.

awaits-'5 JOHN C. WBASS E, OF MISHA'WAKA, INDIANA.

orscur'r-swircn.

Specification of Letters r atent.

Patented Jan. 5, 1915.

Application. filed October so, 1918. Serial at. 793,171.

To all whom it may concern Be it known that. I, J OHN C. WRASSE, citizen of the United States, residing at Mishawaka, in the county of St. Joseph and State of Indiana, have invented certain new and useful Improvements in Circuit-Switches, of which the following is a specification.

This invention relates to improvements in circuit switches, and is especially adapted for use in lighting circuits wherein it is desirous of preventing the flickering of the lights caused by the surge of the electric current from the irregular action of the dynamo.

The objects of this invention are to provide a device of this character which will be simple in construction, cheap to manufacture and efi'ectual in use, and these objects are accomplished by the means illustrated in the accompanying drawings, in which 1-- Figure 1 is a vertical sectional view of the improved device showing the lighting circult closed. Fig. 2 is "a detached perspective view of the solenoid and its attached parts omitting a portion of its supporting frame: and Fig. 3 is a detail perspective view of the solenoid core showin its dasher-plate secured thereto in a di erent position.

y In all of the figures of thedrawings, similar reference numerals designate like parts.

Referring to the drawing, 4 designates a closed casing provided with a removable top 5 to afford access within the casing. Secured to and supported by the sides of the casing 4, is a frame which comprises a base 7 uprights 8', and a to -bar 9, and supported by the frame is a so enoid formed of the coils 10, armature l1, and core 12. Both the armature and the core are laminated and are preferably U-shaped, having their legs extending into the coils, the legs of thearmature passing through apertures 13 in the top-bar 9, and their connecting piece lying upon said bar. The core is vertically movable in the coils and has suspended from its" lower end the laminated contact plate 14;

whose upwardly turned terminals 15" are adapted to engage the stationary contacts 16 having threaded stems 17 and securedto the base 7 by the nuts 18. The upper. ends ofthe stems 17, together with the nuts 18 and the nuts 19, form the binding posts for one end of the lighting circuit wires 2'0, their other ends bemg connected with'the usual" until the terminals 15 of the contact plate 14.

engage the stationary contacts 16, when the ,lighting circuit is closed, as shown in Fig. 1

of the drawing. To assure a perfect con- 5 tact between the terminals 15 and the stationary contacts 16, the contact plate 14 is connected resiliently to the core 12 through .a spring 24 which is connected at its ends by studs 25 to said plate 14 and suspended at'its center from the said core 12 by the studs 26. To prevent the contact betweenthe members 15 and 16 being made with a shock, a dasher plate 27 is fixed to the lower end of the core 12 between the spring 24 and the core, and as shown in Fig. 2, said dasher plate lies in parallel alinement with the spring 24 and the contact-plate 14, and together with said member is adapted to work in 'oil which is contained in the casing 4: and whose level is maintained above the contacting members. Thus it will be seen that a circuit switch is provided whose contacting members are controlled by an oil dash-pot, thereby preventing the closing of the contact points with a shock, and a resiliently suspended contacting plate which will take up any fluctuation of the core due to the surge of the. current from the irregular ac tions of the dynamo, such as variations in speed of the prime mover or variable resistance on the line, whereby these variations will not show in the lights, and insuring a positive non-vibrating contact when the circuit is closed.

The fluctuations of the core owing. to the i varying surgeof the current, will be taken up by the buckling of the spring 24 at its center without disturbing the contact points. Furthermore it wili be seen that by cone,

necting the spring 2% at its ends and center to the contact plate 14 and-studs 26 of th core 12 respectivelyfthat a slight rockingv movement of the contact 12 can bathed,

should one terminal 15 contact before the other due to the looseness of fit of the movable core 12 in the coils 10.

In some instances the spring '24 and the contact plate 14 can be used Without the dasher plate 27, said members forming in themselves a dasher'which would prevent the closing of the contact points with a shock,

but for the best results the use of the plate said spring buckle at its center when the surge of the current is unequal.

2. In a device of'the character described, a frame, two coils mounted in the frame, an armature mounted on the top bar of the frame and provided with legs extending into the coils, a core member movable in both coils, a spring fixed at its center to the movable core, and a contact plate fixed to the ends of said spring, whereby said contact plate can rock independently of its inherent resiliency and said spring buckle at its center when the surge of the current is unequal. In testimony whereof I a'lliX my signature in presence of two Witnesses.

JOHN G. WRASSE. Witnesses:

Enw. F. SUTERIL, ELIZABETH NORMAN. 

